condition mean min max ZT0-3 13.575700000000001 13.575700000000001 13.575700000000001 ZT4-7 20.488 20.488 20.488 ZT8-11 14.0945 14.0945 14.0945 ZT12-15 14.239600000000001 14.239600000000001 14.239600000000001 ZT16-19 11.042895 11.042895 11.042895 ZT20-23 9.39148 9.39148 9.39148